Tapping at the Window is a common Sorcery card from Innistrad: Midnight Hunt (MID), collector number 201. Current market price: $0.20 (foil $0.24), TCGplayer market prices via Scryfall.
Look at the top three cards of your library. You may reveal a creature card from among them and put it into your hand. Put the rest into your graveyard. Flashback {2}{G} (You may cast this card from your graveyard for its flashback cost. Then exile it.)